help me in extended book of math I GCSE on page 57 exercise 7 in grade 10.

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Of course! To assist you with Exercise 7 on page 57 of the Extended Math IGCSE book for grade 10, I would need the specific information or question mentioned in the exercise. Please provide me with the details of the exercise or the specific question you need help with, and I'll be glad to explain and guide you through the solution.